Arthttb george tolmaw



A. G. TOLMAN.

ROOF SURFACING MACHINE.

APPLICATION FILED JAN. 16, my.

Patented Oct. 21,1919.

INVENTOH m! mmm xmmncymm! cm, WASHINGTON, ru c.

ARTHUR GEORGE TOLMAN, 0]? MILWAUKEE, WISCONSIN.

ROOF-SURFACING MACHINE.

Specificationof Letters Patent.

Patented Oct. 21, 1919.

Application filed January 16, 1919. Serial No. 271,593.

To all whom it may concern Be it known that I, ARTHUR Gr. TOLMAN, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful- Improvements in Roof- Surfacing Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in surface treating machines, more particularly of that type adapted to be propelled over a surface to impart treat ment thereto and adapted for treating the gravel surface ofa roof.

A common type of permanent roofing comprises a stratum of tar or similar binder material having gravel embedded therein and loosely disposed thereon. In repairing such roofing, it is desirable to first remove the loose: gravel and the upper stratum of tar embedded gravel so as to avoid an undesirable thickness of the repaired roofing.

It is primarily the object of my invention to provide a machine whereby a roof may be most readily surfaced for the repair operation.

It is more particularly my object to provide a simple and compact machine which may be most readily manipulated to effect either a sweeping or a cutting operation on the roof it being desirable to first sweep off the loose gravel and then remove the gravel which is embedded in the binder ma terial.

V A further and important object resides in the provision of an arrangement for cutting the gravel loose from the binder material in such manner as to prevent gouging of the binder material by particles of gravel and to insure an even cutting operation.

A further object resides in the provision of means for perventing gravel from being thrown upwardly by the cutter blades.

With the above and other objects and advantages in view, which will be apparent as the description proceeds, my invention r sides in the novel features of construction,

combination and arrangement of parts as hereinafter more particularly describedand d fined y a ms- In the accompanying drawings:

Figure 1 is a side elevational view of a roof surfacing machine embodying my invention.

Fig. 2 is a vertical. transverse sectional view through the central portion thereof on an angle iron main frame, including the side sills 5, and to the ends of which is secured upstanding handles 6 whereby the machine may be manually propelled from either, end thereof, although if desired but a single handle structure may be inter changeably employed for the ends of the frame. The central portion of the frame mounts a motor 7 for driving the roof working members of the machine, this motor being mounted on longitudinal bars 8 disposed above the plane of the frame and having their end portions downturned and secured to intermediate transverse frame sills 9, clearance being provided between the bars 8 and intermediate sills 9 for a pairof cen- V "tral supporting wheels 10 disposed within he confines of the frame and mounted on a tubular axletree 11 extending transversely across the frame and having its ends engaged in bearing blocks 12 on the side sills 5. The wheels 10 are confined on the shaft between the bearings 12 and stop collars 13 fixed on the tubular shaft. A drive shaft 14L is extended through the tubular shaft 11 and is journaled in bushings 15' engaged in the bearing blocks 12' outwardly of the tubular shaft 11, it being noted that each end of the tubular axletree 11 extends through substantially half of its corresponding bearing block 12, while the remainder of the bearing block is utilized for the bushing 15. One end of the shaft 14 carries a pulley 16 around which is trained a belt 17. drivenfrom a pulley 18 on the motor shaft. The other end of the shaft; M nut wardly of the opposite side of the main frame carries a pulley 19 around which is its shaft 22 that the periphery of the brush is spaced slightly albovethe ground plane when the main frame of the machine is dis- Q posed horizontally, it being observed that the'frame may freely rock on its single pair of central ground wheels 10.

The other roof working mechanism is adapted for removing the embeddedgravel and constitutes a rotatable cutter including cutter bars 25, two in the present instance, extending transversely of the frame and having'their end portions seated in peripheral recesses 26 of a pair of head disks 27 secured on a shaft '28'journaled in hanger bearings 29 depending from the end portions of the side sills 5 remote from the brush structure. The'cutter bars 25 are secured to the head disks by angle plates 30 andthelength of the bars as well as'of the brush 21 is such as to definea working path equal in width to the distance between the side sills 5 whereby the wheels 10 travel in said path in operation of the machine. The diameter of the path of rotation of the cutter bars is less than the diameter of the-brush 21, and the journal axis of the shaft 28 is disposed below the journal; axis of the brush shaft whereby to dispose the 'rotative path of the brush bars also a slight distance above the ground plane when themain frame otthe machine is disposed horizontally, thus providing for operation of either of the vsurface working mechanisms by simply tilting the corresponding end of the main frame downwardly. The cutter bar shaft28 carries a roller 29 adapted to. receive thedrive belt 20, and thus the only adjustment necessary to adapt the machine for operation of either of the surface working mechanisms is to shift said belt 20 to the pulley of the mechanlsm.

It is noted that the cutter bars 25 are of considerable width, and the outer faces of the bars are curved to provide cylindrical surface sections 30 concentric with the axis of rotation of the cutter mechanism, and these curved surfaces are utilized as shoe faces to prevent gouging of the cutter bars into the roofing material. Also, the sides vents gouging of the roof by careless manipulation and which insures an even'removal of embedded pebbles to a desired depth. As shown in Fig; 4, the cutting edges (6 of the bars, formed by the junctures of the curved shoe faces 30 and the outer facesof the ad jacent recesses 31, engage the larger pebbles at a considerable distance above the finished plane surface, the cutting edges being at the time of engagement in upward movement and thus a rolling movement is imparted to the Pebbles atthe same time that they are displaced from the tar 'in which they are embedded, thus preventing gouging of the 7 roof surfacesuch as would occur were the pebbles dragged forwardly with. a scraping action. It is noted that the cutting bars would have a rotation of approximately 300 7 revolutions per minute and that the speed would be suflicient to clear the larger peb-' bles'from the roof a considerable distance a in advance ofthe traveling line of contact of the rotative path of the cutting edges With the plane of the finished roof surface, j the cutting edges a when meeting the finished roof surface serving to clear away finer particlesv which would not be engaged by the previous movements of "the blades thereover when traveling at a higher elevation. By forming the cutting edges a and recesses 31 on' both sides of the bars, said bars'may be reversed in their cutting action to present fresh cutting edges, and the bars mayf be. most readily resharpened fwhen necessary by cutting in at the outer faces of there cesses 31.

H In the operation of the machine,outilizing the cutting mechanism for instance, the hanmodifications of structure may be resorted to without departing in any manner from the spirit of my invention, as defined by the accompanying claims. I 5 i 7 lVhat is claimediszx V V 1, A surfacing machineof the class described including a frame, a pair of surface engaging wheels carried by said frame, and a driven rotary cutter carried by said frame and engageable with the surface to be treated by tilting the frame.

2. A surfacing machine of the class described including a frame, a pair of surface engaging wheels carried by the frame, a driven rotary cutter carried by said frame and having a plurality of cutting edges and having shoe surface portions disposed rearw-ardly of the cutting edges with respect to the direction of rotation of the cutter, said cutter being engageable with the surface to be treated by tilting the frame.

3. A surfacing machine of the class described including a frame, a pair of surface engaging wheels carried by the frame, a driven rotary cutter carried by said frame and having a plurality of cutting edges and having shoe surface portions extending rear- Wardly from the cutting edges with respect to the direction of rotation of the cutter, said shoe surface portions being curved concentric with the axis of rotation of the cutter, and said cutter being engageable with the surface to be treated by tilting the frame.

a. A surfacing machine of the class described including a frame, ground wheels carried by said frame, a driven rotary cutter carried by said frame and having a plurality of cutting edges, said cutter also being provided with deflecting ledges disposed inward of the cutting edges of the cutter.

5. A surfacing machine including a main frame, ground wheels carried by the frame, a driven shaft carried by the frame, cutter head disks on said shaft, and cutter bars secured to the peripheral portions of said disks, the outer faces of said bars being curved on arcs of a common circle concentric with the axis of the shaft to afford shoe sections engageable with the surface to be treated.

6. A surfacing machine including a main frame, ground wheels carried by the frame, a driven shaft carried by the frame, cutter head disks on said shaft, and cutter bars secured to the peripheral portions of said disks, the sides of said bars being cut away to define deflecting ledges for pebbles engaged by outer edges of the bars.

7. A surfacing machine including a main frame, centrally disposed surface engaging wheels carried by the frame, rotary surface engaging members carried by the frame at the sides of the wheels and spaced from the Work surface when the frame is disposed substantially horizontal, and means for selectively driving said rotary members.

8. A surfacing machine including a main frame, a transverse hollow aXletree secured to the side sills of the frame, supporting wheels mounted on said hollow axletree, a shaft extended through the hollow axletree and projected past the ends thereof, a motor supported on the frame, a drive connection between the motor and one end of the said shaft, a rotary surface engaging member carried by the frame, and a drive connection between said rotary member and the other end of the said shaft.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee, and State of Wisconsin.

ARTHUR GEORGE TOLMAN.

Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents, Washington, D. G." 

